package main

import "fmt"

func countSeniors(details []string) int {
	sum := 0
	for _, v := range details {
		if v[11] > 54 || v[11] == 54 && v[12] > 48 {
			sum++
		}
	}
	return sum
}

func main() {
	var s string = "234234M0033"
	fmt.Println(len(s))
	fmt.Println(s[len(s)-4])
}
